Air filter element having a specific retaining geometry

An air filter element for insertion into an air filter housing, wherein the air filter element comprises:

• an intake surface,
• a discharge surface,
• a filter medium, and
• a filter element-retaining device,
• wherein the filter medium extends between the intake surface and the discharge surface in an axial direction of the air filter element,
• wherein the filter medium forms a plurality of connected axially extending lateral sides defining a radially outer periphery of filter medium, adjacent ones of the plurality of lateral sides forming an axially extending corner where axially extending end edges of adjacent ones of the plurality of lateral sides meet,
• wherein the filter element-retaining device is connected to the filter medium,
• wherein the filter element-retaining device extends along at least one section of the periphery of the filter medium between the intake surface and the discharge surface,
• wherein the filter element-retaining device includes a retaining arrangement that radially projects from the filter medium,
• wherein the retaining arrangement comprises at least one radially projecting convexity,
• wherein a first one of the plurality of lateral sides of the filter medium has arranged spaced apart thereon a first one and a second one of the at least one radially projecting convexity,
• wherein the first one of the at least one radially projecting convexity is arranged on the first one of the plurality of lateral sides adjacent to a first axially extending end edge of the first one of the plurality of lateral sides,
• wherein the second one of the at least one radially projecting convexity is arranged on the first one of the plurality of lateral sides adjacent to an opposing second axially extending end edge of the first one of the plurality of lateral sides.